Clarence l



(No Model.)

0. L. HEALY.

PRINTING TELEGRAPH. N0. 365,994. Patented July 5, 1887.

ES I L/EH OT UNITED STATES ATENT Urrrcn,

CLARENCE L; HEALY, or BnooKLY AssmNon TO THE COMMERCIAL TELEGRAM COMPANY, OF NEW YORK, N. Y.

PRINTING-TELEGRAPH.

SPECIFICATION forming part of Letters Patent No. 365,994, dated July 5, 1887.

Application filed February 9, 1886. Serial No. 191,277: (No model.)

the transmitting-operator, and only momentary current-impulses will traverse these circuits, as described in patent of Stephen D. Field, numbered 290,556.

ln applying this device to a number of prlnting cireuit relays with a, shunt common to all of such relays the cutting out of circuit of a resistance so considerable as that offered by the numerous relays produced a largelyinereased and injurious flow of current through the local circuit. To overcome this obstacle is the object of my present invention. This 1 accomplish by throwing into the local or relay cirenitjnst before the relays are shorteircuited a -large resistance, preferably about equal to the combined resistance of the relays. The printing-circuit relays are not caused to release their armatures by the diminution of current produced by the introduction of this resistance into the circuit, since such armatures are then in a forward position close to the magnet poles, and are attracted strongly; but the introduction of the resistance is followed immediately by the shunting or short circuiting of the relays, which then release their armatures and open the printing-cireuits.

A way of carrying this invention into efi'ect 1 s shown in the accompanying drawing,which 1s a diagram of apparatus and circuits.

A is a dynamo-electric machine supplying current to the local circuit 1 2, including the printingcircuit relays B 13 B B B. This circuit is controlled by armature of a magnet, O, which is controlled from the transmitter key-board, as will be well understood. The

relays B to B" control circuits L, each including the printing-magnets of a number of printingtelegraph receivers, such circuits L being closed when the relay armatures are on their front points. I11 circuit 1 2 is also an el'ectro-magnet, D, whose armature closes another local circuit, 3 4-,at the same time that the relays B to 13 close the printing-circuits. In local circuit 3 4 are included two magnets, EF. Magnet E closes at its front point a shunt-circuit, 5 6, around the relays B to B", while magnet F at its back point short-circuits a resistance, R, in local circuit 1 2,which resistance is preferably about equal to the combined resistance of the relays.

The operation of these parts is as follows, the normal position being shown in the draw ing: WVhen the transmitter comes to rest for printing after the type-wheels are positioned, magnet O closes local circuit 1 2. RelaysB to 13 close printingcircnits L at the same time that magnet D closes local circuit 3 4. Magnets E F then attract their armatures, and in doing so the resistance It is first thrown into circuit 1 2, and then shunt 5 6 is closed, cans ing relays B to B" to open the printing-circuits. This operation takes place within a definite lapse of time, and the parts remain as last described,while circuit 1 2 is continued to be closed; but when magnet O releases its armature and opens circuit 1 2 the parts resume their normal position.

Vhat I claim is-,

1. In printing-telegraphs, the combination, with a number of printing'cireuit relays, of a resistance, a circuit-controller and connections for throwing the resistance into and out of circuit with said relays, a short circuit around said relays, a circuit-controller for opening and closing said short circuit, and electromagnets operati n g said ci reuitcontrollers, whereby the resistance will be thrown into circuit with said relays and the relays will be short-cin cuited, substantially as and for the purpose set forth.

2. In printing telegraphs, the Combination,

with a number of printing-circuit relays and v IOO sistance into and out of circuit with said relays, a short circuit around said relays, acircuit-controller for opening and closing said short circuit, and electro-magnets operating said circuit-controllers, whereby the resistance will be thrown into circuit with said relays and the relays will be short-circuited, substantially as and for the purpose set forth.

3. In printing-telegrapl1s, the combination, with a local circuit and printing-circuit relays included therein, of a magnet in said local relay-circuit controlling a second local circuit in which are included two other magnets, one controlling a shunt around the printing-relays and the other a resistance in the circuit of said relays, substantially as set forth.

4. In printingtelegraphs, the combination,

with a local circuit and relays therein closing the printing-circuits at their front points, of a magnet in said relay local circuit closing a second local circuit at its front point, in which second local circuit are included two magnets, a resistance in the first local or relay circuit short-circuited at, the back point of one of the magnets in the second local circuit, and a shunt around the printing-relays closed at the front point of the other magnet in the second local circuit, substantially as set forth.

This specification signed and witnessed this 23d day of January, 1886.

CLARENCE L. HEALY. \Vitnesses:

W. B. HERBERT, G. BLARNELT. 

